ICD-10-CM > R00-R99 > R90-R94 > R94 > R94.1 > R94.13 R94.13 Abnormal results of function studies of peripheral nervous system Non-Billable/Non-Specific Codes R94.130Abnormal response to nerve stimulation, unspecifiedR94.131Abnormal electromyogram [EMG]R94.138Abnormal results of other function studies of peripheral nervous system